A car of mass 1000 kg travelling at a speed of 40 m/s crashes into a wall and comes to rest in 0.5 sec. Calculate the average force exerted by the wall on the car.
(A) 4 × 104 N
(B) 8 × 104 N
(C) 4 × 104 N
(D) 8 × 104 N 19
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should be 8*10^4
should be 8*10^4
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I think it's (B)...
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